https://support.nascarheat.com/customer/portal/articles/2738541-how-do-i-earn-gold-?b_id=15730
You can earn gold in two ways:
- Come back every day for cash prizes
- Finish races in the Top 5 and spin the podium reward wheel
Note: You can also purchase more gold in the Store or by clicking on the Gold icon at the top of the screen.